Related Party Transactions (Reinsurance Transactions - Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Reinsurance Disclosures [Abstract]
Net derivatives gains (losses)	$ (131,329)	$ 49,158
Other Liabilities	388,868		$ 112,441
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	(89,048)	46,678
Affiliated Entity | Ceded guaranteed minimum benefits
Reinsurance Disclosures [Abstract]
Net derivatives gains (losses)	(25,300)	21,900
Embedded Derivative, Fair Value of Embedded Derivative Asset	354,500		211,200
Affiliated Entity | Variable Annuities MLIC [Member]
Reinsurance Disclosures [Abstract]
Net derivatives gains (losses)	$ (125,100)	$ 46,900
Modified Coinsurance Basis Percent	100.00%
Other Liabilities	$ 129,800
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	84,400
Embedded Derivative, Fair Value of Embedded Derivative Asset	$ 0		$ 168,100